CN104216094A - Optical lens - Google Patents
Optical lens Download PDFInfo
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- CN104216094A CN104216094A CN201310212990.0A CN201310212990A CN104216094A CN 104216094 A CN104216094 A CN 104216094A CN 201310212990 A CN201310212990 A CN 201310212990A CN 104216094 A CN104216094 A CN 104216094A
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Abstract
The invention provides an optical lens comprising a first lens group and a second lens group. The first lens group comprises a first lens, a second lens and a third lens which are coaxial and which are arrayed from the object space to image space sequentially. The second lens group comprises a fourth lens and a fifth lens which are arrayed in the rear of the third lens. The first lens is a biconvex lens with the positive diopter, the second lens is a convex concave lens with the positive diopter and the convex surface facing to the object space, the third lens is a plane concave lens with the negative diopter and the plane facing to the object space, the fourth lens is a biconvex lens with the positive diopter, and the fifth lens is a concave convex lens with the negative diopter and the concave surface facing to the object space. The optical lens provides fine imaging quality at night or in the environment with poor lighting condition, is capable of being adaptive to large temperature change of the external environment and maintains stable performance.
Description
Technical field
The present invention relates to a kind of optical device, particularly relate to a kind of near-infrared optical camera lens.
Background technology
At present, many office spaces, road, even automobile have all installed monitoring camera, these monitoring cameras by day or under the condition of illumination abundance image quality still can, but when at night or when illumination condition is not good enough, the image quality of camera is not high, image is clear not, minutia not easy to identify.
And existing camera, particularly vehicle-mounted camera commercially, not too much consideration temperature variation, on the impact of camera, if larger temperature variation appears in external environment, can cause larger impact to the image quality of monitoring camera.
Summary of the invention
Technical matters to be solved by this invention overcomes one of above-mentioned existing issue, provides a kind of optical lens, and this imaging lens has good image quality at night, and can keep stable performance within the scope of larger variation of ambient temperature.
The invention provides a kind of optical lens, comprise the first mirror group and the second mirror group, described first mirror group comprises coaxially and the first lens be arranged in order from object space to image space, second lens and the 3rd lens, described second mirror group comprises the 4th lens after being arranged in the 3rd lens and the 5th lens, described first lens are the biconvex lens with positive diopter, described second lens are have positive diopter and convex surface facing the meniscus of object space, described 3rd lens be there is negative diopter and plane towards the plano-concave lens of object space, described 4th lens are the biconvex lens with positive diopter, described 5th lens are have negative diopter and the concave-convex lens of concave surface facing object space,
Described optical lens also meets 1.5<|f
1|/f<2.0,0.7<|f
2|/f<0.9,0.3<|f
3|/f<0.5,0.4<|f
4|/f<0.6,0.8<|f
5|/f<0.9, wherein the focal length of the first to the 5th lens is respectively f
1, f
2, f
3, f
4, f
5, the focal length of optical lens is f.
Optical lens provided by the invention, combined by said lens and the restriction of lens parameter, shortening mirror group overall length as much as possible, reduce on the basis of camera lens volume, improve the relative aperture of camera lens, under night or the poor environment of illumination condition, also there is good image quality, and the larger temperature variation of external environment can be adapted to, keep stable performance.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention one optical lens;
Fig. 2 is the curvature of field and the distortion schematic diagram of the embodiment of the present invention one optical lens;
Fig. 3 is the aberration schematic diagram of the embodiment of the present invention one optical lens;
The MTF(optical transfer function that Fig. 4 is the embodiment of the present invention one optical lens temperature when being-30 DEG C) figure;
The MTF(optical transfer function that Fig. 5 is the embodiment of the present invention one optical lens temperature when being 20 DEG C) figure;
The MTF(optical transfer function that Fig. 6 is the embodiment of the present invention one optical lens temperature when being 85 DEG C) figure;
Fig. 7 is the curvature of field and the distortion schematic diagram of the embodiment of the present invention two optical lens;
Fig. 8 is the aberration schematic diagram of the embodiment of the present invention two optical lens;
The MTF(optical transfer function that Fig. 9 is the embodiment of the present invention two optical lens temperature when being-30 DEG C) figure;
The MTF(optical transfer function that Figure 10 is the embodiment of the present invention two optical lens temperature when being 20 DEG C) figure;
The MTF(optical transfer function that Figure 11 is the embodiment of the present invention two optical lens temperature when being 85 DEG C) figure.
Embodiment
In order to make technical matters solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The invention provides a kind of optical lens, comprise the first mirror group 100 and the second mirror group 200, described first mirror group 100 comprises coaxially and the first lens 110 be arranged in order from object space to image space, second lens 120 and the 3rd lens 130, described second mirror group 200 comprises the 4th lens 210 after being arranged in the 3rd lens 130 and the 5th lens 220, described first lens 110 are for having the biconvex lens of positive diopter, described second lens 120 are for having positive diopter and convex surface facing the meniscus of object space, described 3rd lens 130 for there is negative diopter and plane towards the plano-concave lens of object space, described 4th lens 210 are for having the biconvex lens of positive diopter, described 5th lens 220 are for having negative diopter and the concave-convex lens of concave surface facing object space,
Described optical lens also meets 1.5<|f
1|/f<2.0,0.7<|f
2|/f<0.9,0.3<|f
3|/f<0.5,0.4<|f
4|/f<0.6,0.8<|f
5|/f<0.9, wherein the focal length of the first to the 5th lens is respectively f
1, f
2, f
3, f
4, f
5, the focal length of optical lens is f.
In the present invention, combined by said lens and the restriction of lens parameter, shortening mirror group overall length as much as possible, reduce on the basis of camera lens volume, improve the relative aperture of camera lens, under night or the poor environment of illumination condition, there is good image quality, and the larger temperature variation of external environment can be adapted to, keep stable performance.
Concrete, the present invention is by the restriction to first to the 5th focal length of lens, and the focal power of camera lens is distributed well-balanced, the angle of light of each lens is less, reduces the generation of senior aberration, contributes to the image quality promoting camera lens.
In order to make optical system have good image quality in certain temperature range, must consider during design optical system disappear heat difference situation, namely consider conditional:
In formula, h
1be the height of the first paraxial rays at the first lens, h
ibe the height of the first paraxial rays at i-th lens,
for the focal power of lens system,
be i-th power of lens, a
hfor the linear expansion coefficient of exterior mechanical structure, L is the physical construction length of regulator site.
The meaning of above-mentioned conditional is: the total focal length of camera lens relative to the variable quantity of temperature and the telescopic variation amount size of system regulation roughly equal, when symbol is contrary, camera lens have passive compensation disappear heat difference effect.
Formula (1) is simplified further, obtains:
Theoretical according to the focal length of lens, have
So, when
Time, can think that camera lens has the heat difference performance that disappears preferably, usually, its thermal expansivity of metal governor motion a
hfor 2.36x10
-5/ DEG C, L can be considered system back focal length, r
1, r
2for the radius-of-curvature of lens.The focal length of each lens of optical lens provided by the invention is meeting under aforementioned constraints, meets formula (2), can keep well stablizing image quality in larger range of temperature.
Described first lens 110 are for having the spherical lens of positive diopter, and comprise first surface and second surface, wherein first surface is convex surface, and toward object space, second surface is convex surface, toward image space.
Second lens 120 are for having the spherical lens of positive diopter, and comprise the 3rd surface and the 4th surface, wherein the 3rd surface is convex surface, and toward object space, the 4th surface is concave surface, toward image space.
3rd lens 130 are for having negative dioptric spherical lens, and comprise the 5th surface and the 6th surface, wherein the 5th surface is plane, and toward object space, the 6th surface is concave surface, toward image space.
4th lens 210 are for having the spherical lens of positive diopter, and comprise the 7th surface and the 8th surface, wherein the 7th surface is convex surface, and toward object space, the 8th surface is convex surface, toward image space.
5th lens 220 are for having negative dioptric spherical lens, and comprise the 9th surface and the tenth surface, wherein the 9th surface is concave surface, and toward object space, the tenth surface is convex surface, toward image space.
Further, described optical lens meets 1.4<F
1/ F
2<3.8, wherein, the focal length of described first mirror group 100 is F
1, the focal length of described second mirror group 200 is F
2.So can reduce the high-order spherical aberration of whole lens systems, ensure that there is longer rear lens focus simultaneously, for follow-up camera lens module assembling leaves enough spaces, ease of assembly.
Further, described optical lens meets 1.5<n
1<1.6,1.6<n
2<1.7,1.75<n
3<1.95,1.6<n
4<1.7,1.5<n
5<1.6, wherein the refractive index of the first to the 5th lens is respectively n
1, n
2, n
3, n
4, n
5.
Described optical lens meets 50<v
1<60,50<v
2<60,20<v
3<30,50<v
4<60,50<v
5<60, wherein the Abbe number of the first to the 5th lens is respectively v
1, v
2, v
3, v
4, v
5.
The present invention, can the aberration of effective corrective lens by each lens index in reasonable distribution mirror group and Abbe number, makes camera lens have wider operating spectral width at near-infrared band, the image quality of raising camera lens under night-environment.
Described imaging lens also comprises diaphragm 300, described diaphragm 300 between the second lens 120 and the 3rd lens 130, for controlling the luminous flux by eyeglass.
Described imaging lens is also provided with optical filter 400, and described optical filter 400 is between the 5th lens 220 and imaging surface 500.Optical filter 400 has filter action sheet glass, and at least one light transmitting surface plating of sheet glass near infrared anti-reflection film, contributes near infrared light and pass through, improve the image quality of this camera lens near infrared light wave band.
Imaging lens provided by the invention, first lens 110, second lens 120, the 3rd lens 130, the 4th lens 210 and the 5th lens 220 are glass mirror, not easily there is deformation in glass mirror, be conducive to the performance keeping camera lens stable under the environment of larger temperature variation.
Below again by two embodiments, two parts of parameters are provided, can clearly know advantage of the present invention to make technician.
Embodiment one
The present embodiment proposes the correlation parameter of optical lens, specific as follows:
Table 1 minute surface parameter
As shown in Figure 1, in the present embodiment, the parameter of optical lens is as follows:
Wherein, f
1=30.69mm, f
2=14.40mm, f
3=-7.81mm, f
4=9.73mm, f
5=-14.82mm, the focal distance f=18.00mm of camera lens.f
1|/f=1.71；|f
2|/f=0.8；|f
3|/f=0.43；|f
4|/f=0.54；|f
5|/f=0.82。Meet 1.5<|f
1|/f<2.0,0.7<|f
2|/f<0.9,0.3<|f
3|/f<0.5,0.4<|f
4|/f<0.6,0.8<|f
5|/f<0.9.
The focal length of the first mirror group 100 is F
1the focal length of the=28.61, second mirror group 200 is F
2=19.23, F
1/ F
2=1.49, meet relational expression 1.4<F
1/ F
2<3.8.
The camera lens overall length TTL obtained is 22.75mm, lens systems aperture F
nO=1.43, there is larger relative aperture, ensure that abundant light enters, improve image quality.
a
hL=4.72×10
-5/℃
As range of temperature 85-(-30)=115 DEG C time, the total variation of focal plane of lens system is 1.26133 × 10
-6× 115=0.145um, and theoretical according to optical system imaging depth of focus, and the present embodiment system camera lens depth of focus is 2 × λ × F
nO 2=2*0.85um*1.43*1.43=3.4733um, wherein λ is the wavelength of light, and the total variation of focal plane of lens system is much smaller than camera lens depth of focus, and in tolerance interval, therefore it is poor to think that system has the good heat that disappears.
Fig. 2 is the curvature of field and the optical distortion figure of embodiment one imaging lens, and the curvature of field is more little more straight better, reacts in imaging, and on imaging surface, image quality is all consistent, there will not be certain a bit or certain blooming; Distort the smaller the better, react in imaging, straight line there will not be buckling phenomenon; The curvature of field and distortion can not be zero in actual production manufacturing process, can only be the smaller the better.
As can be seen from Figure 2, the optical lens of the present embodiment, the curvature of field is less than 0.10mm, and optical distortion is less than 2%, and magnification is even everywhere to reflect the overall image planes of this camera lens, and aspect ratio coupling outdoor scene, has good optical property.
As can be seen from Table 1, the refractive index of each lens of optical lens of the present embodiment and Abbe number are in limited field of the present invention, can the aberration of effective corrective lens, make camera lens have wider operating spectral width at near-infrared band, improve the image quality of camera lens under night-environment.
Fig. 3 is the Optical Chromatic figure of the embodiment of the present invention one optical lens, and the Aili spot diameter of camera lens is 3um, and the aberration of the present embodiment optical lens is less than Aili spot diameter as we know from the figure, and the aberration of visible camera lens obtains well-corrected.
Fig. 4,5,6 is the modulation transfer function of the embodiment of the present invention one imaging lens respectively at-30 DEG C, 20 DEG C, 85 DEG C (Modulation Transfer Function, be called for short MTF) curve map, transverse axis representation space frequency in figure, unit: line is to every millimeter (lp/mm); The longitudinal axis represents the numerical value of modulation transfer function (MTF), and the numerical value of described MTF is used for evaluating the image quality of camera lens, and to be that 0-1, MTF curve is more high more directly represent that the image quality of camera lens is better to span, stronger to the reducing power of true picture.
Can learn from figure, meet optical lens that restrictive condition of the present invention obtains under the temperature conditions of-30 DEG C, 20 DEG C, 85 DEG C, its optical transfer function MTF at 130lp/mm place all more than 0.25, illustrate under larger temperature variations, the optical lens of the present embodiment still has acceptable contrast ratio and good image quality, the temperature variation that external environment is larger can be adapted to, keep stable performance.
Embodiment two
The present embodiment proposes the correlation parameter of optical lens, specific as follows:
Table 2 minute surface parameter
As shown in Figure 1, in the present embodiment, the parameter of optical lens is as follows:
Wherein, f
1=31.22mm, f
2=15.41mm, f
3=-7.06mm, f
4=8.70mm, f
5=-15.47mm, the focal distance f=18.10mm of camera lens.|f
1|/f=1.73；|f
2|/f=0.85；|f
3|/f=0.39；|f
4|/f=0.48；|f
5|/f=0.85。Meet 1.5<|f
1|/f<2.0,0.7<|f
2|/f<0.9,0.3<|f
3|/f<0.5,0.4<|f
4|/f<0.6,0.8<|f
5|/f<0.9.
The focal length of the first mirror group 100 is F
1the focal length of the=36.90, second mirror group 200 is F
2=13.70, F
1/ F
2=2.69, meet relational expression 1.4<F
1/ F
2<3.8.
The camera lens overall length TTL obtained is 23.61mm, lens systems aperture F
nO=1.43, there is larger relative aperture, ensure that abundant light enters, improve image quality.
a
hL=3.73×10
-5/℃
As range of temperature 85-(-30)=115 DEG C time, the total variation 3.13832 × 10 of focal plane of lens system
-6× 115=0.36um, and theoretical according to optical system imaging depth of focus, and the present embodiment system depth of focus is 2 × λ × F
nO 2=2*0.85*1.43*1.43=3.4733um, wherein λ is the wavelength of light, and the total variation of focal plane of lens system is much smaller than camera lens depth of focus, and in tolerance interval, therefore it is poor to think that system has the good heat that disappears.
Fig. 7 is the curvature of field and the optical distortion figure of the embodiment of the present invention two imaging lens, and the curvature of field is more little more straight better, reacts in imaging, and on imaging surface, image quality is all consistent, there will not be certain a bit or certain blooming; Distort the smaller the better, react in imaging, straight line there will not be buckling phenomenon; The curvature of field and distortion can not be zero in actual production manufacturing process, can only be the smaller the better.
As can be seen from Figure 7, the optical lens of the present embodiment, the curvature of field is less than 0.10mm, and optical distortion is less than 2%, and magnification is even everywhere to reflect the overall image planes of this camera lens, and aspect ratio coupling outdoor scene, has good optical property.
As can be seen from Table 2, the refractive index of each lens of optical lens of the present embodiment and Abbe number are in limited field of the present invention, can the aberration of effective corrective lens, make camera lens have wider operating spectral width at near-infrared band, improve the image quality of camera lens under night-environment.
Fig. 8 is the Optical Chromatic figure of the embodiment of the present invention two optical lens, and the Aili spot diameter of camera lens is 3um, and the aberration of the present embodiment optical lens is less than Aili spot diameter as we know from the figure, and the aberration of visible camera lens obtains well-corrected.
Fig. 9,10,11 is the modulation transfer function of the embodiment of the present invention two imaging lens respectively at-30 DEG C, 20 DEG C, 85 DEG C (Modulation Transfer Function, be called for short MTF) curve map, transverse axis representation space frequency in figure, unit: line is to every millimeter (lp/mm); The longitudinal axis represents the numerical value of modulation transfer function (MTF), and the numerical value of described MTF is used for evaluating the image quality of camera lens, and to be that 0-1, MTF curve is more high more directly represent that the image quality of camera lens is better to span, stronger to the reducing power of true picture.
Can learn from figure, meet optical lens that restrictive condition of the present invention obtains under the temperature conditions of-30 DEG C, 20 DEG C, 85 DEG C, its optical transfer function MTF at 130lp/mm place all more than 0.25, illustrate under larger temperature variations, the optical lens of the present embodiment still has acceptable contrast ratio and good image quality, the temperature variation that external environment is larger can be adapted to, keep stable performance.
Can find out from the above embodiments, optical lens provided by the invention, the restriction of scioptics combination and lens parameter, shortening mirror group overall length as much as possible, reduce, on the basis of camera lens volume, to improve the relative aperture of camera lens, under night or the poor environment of illumination condition, there is good image quality, and the larger temperature variation of external environment can be adapted to, keep stable performance.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. an optical lens, it is characterized in that, comprise the first mirror group and the second mirror group, described first mirror group comprises coaxially and the first lens be arranged in order from object space to image space, second lens and the 3rd lens, described second mirror group comprises the 4th lens after being arranged in the 3rd lens and the 5th lens, described first lens are the biconvex lens with positive diopter, described second lens are have positive diopter and convex surface facing the meniscus of object space, described 3rd lens be there is negative diopter and plane towards the plano-concave lens of object space, described 4th lens are the biconvex lens with positive diopter, described 5th lens are have negative diopter and the concave-convex lens of concave surface facing object space,
Described optical lens also meets 1.5<|f
1|/f<2.0,0.7<|f
2|/f<0.9,0.3<|f
3|/f<0.5,0.4<|f
4|/f<0.6,0.8<|f
5|/f<0.9, wherein the focal length of the first to the 5th lens is respectively f
1, f
2, f
3, f
4, f
5, the focal length of optical lens is f.
2. optical lens as claimed in claim 1, it is characterized in that, described optical lens meets 1.4<F
1/ F
2<3.8, wherein, the focal length of described first mirror group is F
1, the focal length of described second mirror group is F
2.
3. optical lens as claimed in claim 1, it is characterized in that, described optical lens meets 1.5<n
1<1.6,1.6<n
2<1.7,1.75<n
3<1.95,1.6<n
4<1.7,1.5<n
5<1.6, wherein the refractive index of the first to the 5th lens is respectively n
1, n
2, n
3, n
4, n
5.
4. optical lens as claimed in claim 1, it is characterized in that, described optical lens meets 50 <v
1<60,50<v
2<60,20<v
3<30,50<v
4<60,50<v
5<60, wherein the Abbe number of the first to the 5th lens is respectively v
1, v
2, v
3, v
4, v
5.
5. optical lens as claimed in claim 1, it is characterized in that, also comprise diaphragm, described diaphragm is between the second lens and the 3rd lens.
6. optical lens as claimed in claim 1, is characterized in that, also comprise optical filter, after described optical filter is positioned at the 5th lens.
7. optical lens as claimed in claim 6, is characterized in that, described optical filter is coated with near infrared anti-reflection film.
8. optical lens as claimed in claim 1, it is characterized in that, described first lens, the second lens, the 3rd lens, the 4th lens and the 5th lens are glass mirror.
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|---|---|---|---|
| CN201310212990.0A CN104216094B (en) | 2013-05-31 | 2013-05-31 | A kind of optical lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310212990.0A CN104216094B (en) | 2013-05-31 | 2013-05-31 | A kind of optical lens |
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| Publication Number | Publication Date |
|---|---|
| CN104216094A true CN104216094A (en) | 2014-12-17 |
| CN104216094B CN104216094B (en) | 2017-03-15 |
Family
ID=52097780
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|---|---|---|---|
| CN201310212990.0A Active CN104216094B (en) | 2013-05-31 | 2013-05-31 | A kind of optical lens |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107272304A (en) * | 2016-03-30 | 2017-10-20 | 德尔福技术有限公司 | For the photomoduel used on vehicle |
| CN110261994A (en) * | 2018-03-12 | 2019-09-20 | 信泰光学(深圳)有限公司 | Imaging lens |
| CN111796400A (en) * | 2020-07-31 | 2020-10-20 | 华北水利水电大学 | Dynamic star simulator projection optical system with heat dissipation difference |
| CN112612116A (en) * | 2020-12-30 | 2021-04-06 | 厦门力鼎光电股份有限公司 | Optical imaging lens |
| CN113784033A (en) * | 2021-09-18 | 2021-12-10 | 苏州亚博汉智能科技有限公司 | Compact type notebook computer camera structure |
| WO2022016629A1 (en) * | 2020-07-22 | 2022-01-27 | 常州市瑞泰光电有限公司 | Optical camera lens |
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| CN102109659A (en) * | 2009-12-24 | 2011-06-29 | 索尼公司 | Optical unit and image pickup apparatus |
| CN102109661A (en) * | 2009-12-24 | 2011-06-29 | 索尼公司 | Optical unit and image pickup apparatus |
| CN102959448A (en) * | 2010-06-28 | 2013-03-06 | 索尼公司 | Image capture lens and image capture device |
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| US4830478A (en) * | 1987-07-24 | 1989-05-16 | Minolta Camera Kabushiki Kaisha | Video projector lens system |
| CN102109659A (en) * | 2009-12-24 | 2011-06-29 | 索尼公司 | Optical unit and image pickup apparatus |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107272304A (en) * | 2016-03-30 | 2017-10-20 | 德尔福技术有限公司 | For the photomoduel used on vehicle |
| CN110261994A (en) * | 2018-03-12 | 2019-09-20 | 信泰光学(深圳)有限公司 | Imaging lens |
| US10942337B2 (en) | 2018-03-12 | 2021-03-09 | Sintai Optical (Shenzhen) Co., Ltd. | Lens assembly |
| CN110261994B (en) * | 2018-03-12 | 2021-03-26 | 信泰光学(深圳)有限公司 | Imaging lens |
| WO2022016629A1 (en) * | 2020-07-22 | 2022-01-27 | 常州市瑞泰光电有限公司 | Optical camera lens |
| CN111796400A (en) * | 2020-07-31 | 2020-10-20 | 华北水利水电大学 | Dynamic star simulator projection optical system with heat dissipation difference |
| CN111796400B (en) * | 2020-07-31 | 2022-04-01 | 华北水利水电大学 | Dynamic star simulator projection optical system with heat dissipation difference |
| CN112612116A (en) * | 2020-12-30 | 2021-04-06 | 厦门力鼎光电股份有限公司 | Optical imaging lens |
| CN113784033A (en) * | 2021-09-18 | 2021-12-10 | 苏州亚博汉智能科技有限公司 | Compact type notebook computer camera structure |
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|---|---|
| CN104216094B (en) | 2017-03-15 |
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